Description
A surge protective device clamps the transient spikes that lightning and grid switching push down the supply — the events that kill inverters, TVs and router power supplies without ever tripping a breaker.
40kA is the sensible rating for a domestic or small commercial board. The cartridge has a mechanical status window that turns red when the device has absorbed its life’s worth of energy and needs replacing.
An SPD only works if it is properly earthed. If your earth is poor, fix that first — the device has nowhere to send the energy otherwise.
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